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Thread: Bolted connections, submerged in oil. How to ensure safety?

  1. #1
    Associate Engineer
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    Bolted connections, submerged in oil. How to ensure safety?

    I have a unique application where I need to mount a piece of machinery such that the mounting bolts will be inside a gearbox, submerged in oil, and subjected to heat (up to 100C) and vibration. This connection is critical to the function of the machine, and safety of the operators.

    Any recommendations on how to ensure the bolts do not vibrate or become loose in such an environment?

  2. #2
    Administrator Kelly Bramble's Avatar
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    Welcome to EE!

    Look at the following:

    Distorted thread locknut
    Nylon Insert Lock Nut
    Castlelated Lock Nut
    Flange Lock Nut
    Auto Lock Nut

    Lockwire
    Lockwire Installation #1

    Lockwire Installation #2
    Last edited by Kelly Bramble; 01-27-2014 at 11:16 AM.

  3. #3
    Technical Fellow jboggs's Avatar
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    There are numerous mechanical methods. You might also contact Loctite for their recommendations.

  4. #4
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    Quote Originally Posted by Kelly Bramble View Post
    Welcome to EE!

    Look at the following:

    Distorted thread locknut
    Nylon Insert Lock Nut
    Castlelated Lock Nut
    Flange Lock Nut
    Auto Lock Nut

    Lockwire
    Lockwire Installation #1

    Lockwire Installation #2
    Thank you for the suggestions. The mounting uses Socket Head Cap Screws into threads cut in housing, so unfortunately any lock nut is not an option.
    I had also considered the lock wire, which will definitely keep the bolts in place, but I have no experience with this method. These bolts hold pressure on a taperlock locking ring, so any loss in torque is not acceptable. Will the lock wire process guarantee no loss in torque?
    (corporate firewall prevents videos, so I am unable to view the linked videos)

  5. #5
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    Quote Originally Posted by jboggs View Post
    ... You might also contact Loctite for their recommendations.
    For some reason I had in my head that the elevated temp. would rule out Loctite. Upon closer inspection, they now have high temp options. I have an inquiry out to see if the gear oil will be a factor. Thanks for the suggestion.

  6. #6
    Administrator Kelly Bramble's Avatar
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    Quote Originally Posted by iamjonlawrence View Post
    The mounting uses Socket Head Cap Screws into threads cut in housing
    Can the housing be modified for thread locking inserts?

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